Freelance A bit drastic but... do you really need to keep things that would only be kept in a garage or loft? I say this because DH and I had quite a bit of stuff that fit into this category, yet we've always lived in small places (London! Gah!) so never much in the way of storage. We got a lot of stuff as wedding gifts and felt like we should keep a hold of things, just in case, or what if we need it in a year, etc.
We moved in to our current place. Least amount of storage ever for us so far. It drove me up the wall. DH just said, "Do we really need this stuff? We're not using most of it". Cue mass cull of furniture (selling, giving to friends who'll use it, and such), followed by kitchenwares, even down to plates and mugs, baby clothes (we got given a lot of stuff that we didn't use because it was too fussy), toiletries, clothes, shoes, coats... everything. We've been cutting down on and off for the last year and a bit. Most is done, just a few more bits to go. We still have plenty of stuff! And we held on to the very sentimental pieces. But the random bits and bobs 'just in case, what if we regret it in 1/5/10 years...', all gone.
I'm not saying you should dive in and start chucking left, right and centre, but sometimes it's easier if we start being honest about what we really need and love in our homes and what is there just because. The minimalism thread over on Good Housekeeping has tips and support. Especially if, like us, you move a lot, or can't guarantee income and therefore can't guarantee a set home for years, or afford a big place, it helps to lighten the load a bit! (especially if you do sell some stuff and make a little money!)